Dawn Redux?

I’m wondering a bit about the next season of Alias. I can see why they have to write JG’s pregnancy into the storyline, it is really hard to hide your stomach behind furniture placement and clothing in a spy show. And maybe they can do something intresting with the Rimbaldi storyline, Sydney could be preganat with the anti-Rimbaldi or perhaps Rimbaldi’s clone. But I’m wondering about the uncast new agent female agent who is going to appear. I understand they probably can’t have Sydney run around in a bikini anymore, but the whole situation seems a bit like the introduction of Dawn on Buffy the Vampire Slayer for me. And we all know how well that worked out…